Gcu 476 (Optional; Power - Garmin G900X Installation And Maintenance Manual

A.8 GCU 476 (optional)
A.8.1 P4751 Connector
Pin Pin Name
1 RS-232 OUT 1
2 RS-232 IN 1
3 RS-232 OUT 2
4 RS-232 IN 2
5 POWER GROUND
6 SIGNAL GROUND
7 AIRCRAFT POWER 1
8 SIGNAL GROUND
9 AIRCRAFT POWER 2
10 CONTROL UNIT REMOTE POWER OFF
11 LIGHTING BUS HI
12 LIGHTING BUS LO
13 RESERVED
14 RESERVED
15 POWER GROUND
A.8.2

Power

Pin Name
AIRCRAFT POWER 1
AIRCRAFT POWER 2
POWER GROUND
POWER GROUND
SIGNAL GROUND
SIGNAL GROUND
AIRCRAFT POWER 1 and AIRCRAFT POWER 2 are "diode ORed" to provide power redundancy.
A.8.2.1 Remote Power Off
Pin Name
CONTROL UNIT REMOTE POWER OFF
This input is used to power down the GCU 476, by a remote source. An input voltage between 6.5 VDC
and 33 VDC will power-off the GCU 476. An input voltage of 3.5 VDC or less will allow the GCU 476
to power on.
G900X/G950 Installation and Maintenance Manual – Pinouts
190-00719-00
View of J4751 connector from back of unit
Connector Pin
P4751 7
P4751 9
P4751 5
P4751 15
P4751 6
P4751 8
Connector Pin
P4751 10
Page A-75
Revision D
I/O
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